Answer
See the detailed answer below.
Work Step by Step
$$\color{blue}{\bf [a,b,c]}$$
The electrons will follow the single-slit pattern, as shown in the first figure below below.
We can see that the $|\psi(x)|^2$ follows the classical intensity pattern of single-slit diffraction, as seen in the second figure below.
And $|\psi(x)|$ is the square root of the second graph with keeping in mind that it is a wave-like function, that oscillates between positive and negative.
